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A soliton of the Kalb-Ramond field in closed bosonic string theory is introduced. Under
appropriate configurations the cosmological constant becomes a periodic function
of the Kalb-Ramond field. This vacuum degeneracy permits the formation of sine-
Gordon solitons. The energy and length scale of the soliton is inversely proportional
to the string coupling constant g[sub s]. The stability of the the solitons is discussed and
it is shown that these objects are stable.

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